Photovoltaic power station direct current boosting collection access system and control and protection method thereof

Abstract

The present invention discloses a photovoltaic power station direct current boosting collection access system and a control and protection method thereof. The system comprises a generation unit and acollection transmission unit, the generation unit formed by a photovoltaic array module and a DC/DC converter outputs a direct current, the direct current is subjected to direct current boosting through a boosting converter, is collected in a combiner box for uniform output and is converted to an alternating current through an inversion converter to be merged into a large power grid. The system fully employs the controllability of the DC/DC converter, the inversion converter and the boosting converter and the reliability of the protection device to avoid the problems in an alternating currentmode so as to improve the safe and stable operation capacity of the photovoltaic power station direct current boosting collection access system. The control and protection method performs control andprotection segmentation and control and protection layering processing of the system to perform accurate control and protection of the system through coordination between the system control and protection subareas and the system control and protection layers so as to achieve safe, stable and reliable operation when the photovoltaic power station accesses the large power grid in the direct currentboosting collection mode.

Description

technical field [0001] The present application relates to the technical field of new energy power generation and grid connection, and in particular, to a DC boost collection access system for photovoltaic power plants and a control and protection method thereof. Background technique [0002] Traditional energy power generation will emit a lot of greenhouse gases and other pollutants, causing serious environmental problems, and the reserves of fossil energy are decreasing year by year, which makes the renewable clean energy power generation technology develop rapidly. Among them, photovoltaic power generation has developed rapidly as the most potential renewable clean energy power generation technology. It can be seen that the research on solar photovoltaic power plants has huge advantages. Compared with small photovoltaic power generation systems, large photovoltaic power plants can utilize solar energy more concentratedly, fully and efficiently, and can meet the grid-friend...

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Problems solved by technology

[0005] This application provides a photovoltaic power station DC boost collection access system and its control and protection method to solve the problem that the traditional protection method cannot guarantee the safe and reliable operation of the photovoltaic power station when it is connected to the large power grid in the form of DC boost collection

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